Useful tools, without the nonsense.

Calculate network, broadcast, mask and host range from an IPv4 CIDR.

Convert IPv4 addresses between dotted decimal, integer, hexadecimal and binary.

Convert IPv4 CIDR prefixes and subnet masks.

Quickly look up common TCP/UDP service port numbers.

Inspect a user-agent string and identify browser, OS and device class.

Convert bytes, KB, MB, GB, KiB, MiB and GiB.

Convert Celsius, Fahrenheit and Kelvin.

Calculate the precise difference between two dates.